Thermostat



(No Model.) I V U ORT R.

THERMOSTAT.

No. 296,058. Patented Apr. 1, 1884.

Inventor.

min/saved V flfqjor-flarie 2074667.

n. PETERS. mmuma npm. Washinglnn, n c

UNITED STATES PATENT OFFICE.

MAJOR Dr NE PORTER, OF BOSTON, MASSACHUSETTS.

TH E R M-OSTAT.-

SPECIFICATION forming part of Letters Patent No. 296,058, dated April 1, 1884.

Application filed December 11, 1883. (No model.)

To all whom it may concern:

Be it known that I, MAJOR DANE PORTER, a'resident of Boston, in the county of Suffolk, of the Commonwealth of Massachusetts, but a subject of the Queen of Great Britain, have invented a new and useful Improvement in Thermostats; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which Figure 1 is a top view, Fig. 2 a front elevation, and Fig. 3 arear view, of athermostat embracing my invention, the nature of which is defined in the claim hereinafter presented. The said thermostatis intended for use in a building, and to be so connected with the ground and main wires of an electric circuit as to be capable. when the springs or the abutments thereof of the thermostat are brought into contact by expansion of either or both of such springs by heat to effect a closing of the circuit, to cause an alarm to be given at a distant station to which the circuit may be extended. In the drawings, A denotes a plate, of hard rubber or other suitable electric insulating material, having at opposite parts of it two metallic circuit-wire clamps, B B, extending from one face of it. Between the said clamps there are arranged, as shown, and suitably se--- cured to the plate at or near one end of each, by screws to a, two separate volute or bow springs, O 0, made of the usual thermostatic metal, which near their toes or free ends are turned or bent toward each other, so as to form to each an abutment, b. These abutments need not necessarily be of the form represented, as they may be otherwise shaped or adapted, in order to abut together by movements of the springs induced by heat or a rise in temperature. one of the said springs, a small tooth is extended into a groove, 6, formed in and around the shank of a screw, D, that is screwed into and through a proj ection,f, extending from the plate A. This screw and tooth are for adj usting the abutment of the spring 0 in distance from the spring O or its abutment, the said spring 0 being free to turn on its screw or.

From the heel or fastening-head c of From the fastening-screws, or from the heels of tion with an adjusting-screw, D, having a groove, 6, which groove engages the tooth on the spring, as set forth.

MAJOR DANE PORTER.

Fitnesses:

R. H. EDDY, E. B. PRATT. 

